Check the listing for details. Natural Chemistry 3.15 lb Spa Oxidizing Shock. Condition: New. Listed at 32.99 USD. Natural Chemistry’s Spa Oxidizing Shock™ is a powerful oxygen-based oxidizer Spa Oxidizing Shock dissolves quickly and is gentle on spa surfaces. Contains no chlorine or other sanitizer and should be used for oxidizer treatment only. For routine disinfection, use an EPA registered sanitizer according to label directions. Spa Oxidizing Shock is compatible with spas using chlorinating or brominating products. Features: Powerful oxygen-based oxidizer Compatible with chlorine and bromine Gentle on all spa surfaces Dissolves quickly SHIPPING: We will do our best to ship your order based on the shipping method selected, however in some cases, your shipping method may need to be modified to meet shipping requirements based on the carrier. Our current carriers used are UPS, FedEx and USPS. Please contact us directly through the "Contact Seller" link if you need UPS, FedEx or USPS specifically for your order.